removed slack build notifications [ci skip]

.travis.yml

@@ -32,11 +32,6 @@ notifications:
     on_success: change
     on_failure: always
     on_start: false
-  slack:
-    rooms:
-      secure: "lngJ/HEAFBbD5AdiO9avMqptKpZHdmEwOzS9FabZjkdFh7yAYueTk5RniPUvShjsKtThYm7cJ8AtDMDwc07NvPrzbMBRtUJGwuDT+7c7YFALGFJ1NYi+emkC9x1oafvmPgEYSE+tMKzNcwrHi3ytGgKdIotsKwaF35QNXYA9aMs="
-    on_success: change
-    on_failure: always
 before_deploy:
 - mvn -fmain/pom.xml -Prelease clean package -DskipTests
 deploy: